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Old 01-08-2009, 11:33 PM   #1
HiDesert Jeep's Avatar
Join Date: Oct 2008
Location: Bend, Oregon
Posts: 12
New Gears for a 08 Sahara

I hate to bring up a topic that there is probably a thread on already but I haven't found one that fits my exact question.
Here it is: I have a 08 JK Unlimited 4 door Sahara w/ auto trans. and 3:73 gears. I put 33" tires on it and now I want to change the gearing. I think I have a Dana 30 or 35 on the front end and I am told that they don't make a 4:10 gear ratio for this and the closest is 4:56. What I want to know is what will the RPM's be at 65 mph? How can I figure out what front end I have for sure?

Thanks for any insight.

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Old 01-09-2009, 04:23 AM   #2
Hilldweller's Avatar
Join Date: Apr 2008
Posts: 4,083
Of course they make a 4:10 for it; it was an option in '07 for the Sahara with the same D30 axle.
But go to 4.56, especially with the autotrans. Also try to avoid any of the Superior Gear family of gears if you can; they aren't machined extremely well and have a better than average chance of being noisy.
I have 4.56's and they are a wonderful improvement; it's a completely different vehicle.

Gone camping,

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Old 01-09-2009, 09:57 AM   #3
Join Date: Nov 2008
Posts: 39
Ha, Gears!! I once had a 1966 Tuxedo Park, flat head 4, with 5:38's. Top speed
was 62MPH screaming!
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Old 01-09-2009, 11:27 AM   #4
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Join Date: Apr 2008
Posts: 4,083
I towed my trailer down to Florida for Christmas and was going 82.3 mph (according to the gps) at one point without realizing it. The JK has plenty up top; what it's lacking is bottom end power.
4.56 and 33's is great.
Gone camping,

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